<!DOCTYPE html><html>	<head>		<title>test Notification</title>	</head>	<body>	<button onclick="showNotify()">通知</button><script>function showNotify() {	if (Notification.permission === "granted") {	  const notification = new Notification("Hello!");	} else if (Notification.permission !== "denied") {	  Notification.requestPermission().then((permission) => {		if (permission === "granted") {		  const notification = new Notification("Hello!");		}	  });	}}</script>	</body></html>